DVI - no signal

I have never bothered trying to use a DVI connector for monitors, so have no idea what the problem is here.
I just had a new monitor delivered and was trying to 'add' the second one - no joy.
I then tried using only the new one (DVI) - no joy.
With VGA only, it is fine.

Using the nVidia configuration control panel, it sees the new monitor and lets me change resolution, etc - but no power/signal.

Year old system (XP Pro) with:
Gigabyte GA-EP45-UD3P and
EVGA 512-P3-N975-AR GeForce 9800 GT

This might be as simple as some kind of BIOS setting, but having zero experience thought I would post before I screw something up.

I've done a wide variety of "Google" searches, but can't find anything that really applies.
The drivers for both monitors (LG and Viewsonic) are the latest and I am checking for any updates on the BIOS.

Edit: During the boot up process, there is full display with the DVI connector. I can get into "Safe Mode" with the DVI - but "Monitor" is NOT displayed when I go to "Device Manager".
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younghvAsked:
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TripyreCommented:

Windows XP (and 2000) often enables only one display by default.
(This info is probably in the Help info in Windows, and/or in the Help info for your display adapter)
Go to Control Panel - Display Properties - Settings.
Hold your cursor over the displays - if one is disabled you will see "Not Active".
In that case, RIGHT click on the disabled display and enable it. You may need to reboot as well.
This has a step by step on how to.
http://www.microsoft.com/windowsxp/using/setup/hwandprograms/monitors.mspx#3 
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younghvAuthor Commented:
Tripyre,
Thank you, but they are both showing in settings. I've done this about a zillion times with VGA, just never with DVI.

Both are in "Device Manager".
Both have the latest drivers.

I think that the fact that it works in Safe Mode, but not in Normal is the biggest clue (but I don't know what it means).
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willcompCommented:
Works in safe mode but not in normal mode usually denotes a driver issue. Have you updated the nVidia drivers?

This is really strange. Especially when DVI does not work as only monitor connected. Some older VGA/DVI monitors required input selection using monitor controls but all I've seen recently auto-selected based on connection. And they work on bootup and in safe mode -- so input selection is obviously not the cause.

Do the monitors have a VGA (D-Sub) input? What happens when connected with D-Sub?
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younghvAuthor Commented:
Hey Dalton - LOL!
I had to Google that one: http://en.wikipedia.org/wiki/VGA_connector

Both work fine in VGA.

I will go back and double check the nVidia drivers again - but I'm pretty sure I updated them yesterday.

One monitor is a little older (L226WTQ), but the other is a brand new ViewSonic X Series VX2433wm

http://www.newegg.com/Product/Product.aspx?Item=N82E16824116401&cm_re=viewsonic_monitor-_-24-116-401-_-Product

FYI - I just loaded some of the apps from the Gigabyte CD and will be double-checking all of the drivers for the motherboard.
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Davis McCarnOwnerCommented:
You may be in between a rock and a hard place as DVI will insist on querying the monitor and will hate non-native resolutions.  The first thing to do is to update the driver for the Viewsonic and you can get it here: http://www.viewsonic.com/products/desktop-monitors/lcd/x-series/vx2433wm.htm We need it to not be a generic monitor.
Part two is verifying the NVidia drivers include the 1920×1080 native resolution of the monitor.  Do a List All Modes on the adapter tab of the Advance Settings. If it isn't listed, we'll have to find drivers for the card that include that resolution.
If it does have 1920×1080 set that as the resolution on the Viewsonic and try exending your desktop to it.  Reboot to verify it works, then change that to be the primary display, uncheck extending the desktop to the old LCD, reboot again to be safe, and, if everything is working, unplug the old monitor.
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arnoldCommented:
Check whether they are both enabled in the display properties i.e. extend the desktop to this monitor.

Check the resolution you are setting on the DVI connected device.
Presumably the DVI monitor also has a VGA connector, check whether it autodetects which connection is present or whether you can switch it directly to VGA(Analog) Digital.
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younghvAuthor Commented:
Going to have to take a time-out on the whole DVI thing...I updated the BIOS (from Gigabyte) and now the computer is stuck on "Verifying DMI Pool Data" during POST.

I'm looking around EE for some solutions.

Back when I can get the D@mn thing to boot.
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willcompCommented:
Vic -- that's a dual BIOS motherboard. Load the backup copy.
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younghvAuthor Commented:
Dalton,
Sorry for the delay - I took a long walk.
I'm up at the Gigabyte site now, looking for the steps to do the 'backup copy' trick.

Vic
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younghvAuthor Commented:
No joy up there.
Anyone know the proper key sequence to load the backup copy of your BIOS on a Gigabyte GA-EP45-UD3P?
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arnoldCommented:
The process is supposed to be automatic.
http://www.giga-byte.com/FileList/WebPage/mb_081226_dualbios/tech_081226_dualbios.htm
Try hitting del,F1 or wait it might be trying to recover the BIOS in that stage.
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willcompCommented:
I read the mobo manual and Gigabyte has changed DualBIOS -- could have been a while and I haven't been paying attention. Earlier DualBIOS mobos had a boot message with key defined to allow DualBIOS access. You could select which BIOS copy to boot from (also could copy current BIOS to backup BIOS). That obviously is no longer the case. Will see what I can find.
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willcompCommented:
Also, did you load Optimized Defaults after flashing BIOS?
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younghvAuthor Commented:
Hey Dalton - thanks for hanging in there with me.
That computer is out in the workshop and this one is in the office - and I keep getting hung up out there.

I went at this kind of bass-ackwards, but:

1. Download the latest BIOS updates (self-extracting executable) and extract them to a USB (Flash) drive.
2. Insert Flash and boot the computer - tapping the "Del" key. This starts the "Q-Flash" function.
3. Navigate in Q-Flash to the Flash Drive and "update BIOS".

4. YES! Change the BIOS to "Load Optimized Defaults" (didn't work the first time).

Back up and running and I'm taking the rest of the day off.

I might beat on this thing some more tonight, or I might just leave well enough alone.

Vic
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Davis McCarnOwnerCommented:
Now that we're back to the original problem; I'll try again:

You may be in between a rock and a hard place as DVI will insist on querying the monitor and will hate non-native resolutions.  The first thing to do is to update the driver for the Viewsonic and you can get it here: http://www.viewsonic.com/products/desktop-monitors/lcd/x-series/vx2433wm.htm We need that driver to be the Viewsonic and to not be a generic monitor.
Part two is verifying the NVidia drivers include the 1920×1080 native resolution of the monitor.  Do a List All Modes on the adapter tab of the Advanced Settings. If it isn't listed, we'll have to find drivers for the card that include that resolution.
If it does have 1920×1080 set that as the resolution on the Viewsonic and try exending your desktop to it.  Reboot to verify it works, then change that to be the primary display, uncheck extending the desktop to the old LCD, reboot again to be safe, and, if everything is working, unplug the old monitor.
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khiggins1979Commented:
play with all the buttons on the monitor and make sure its on DVI input.
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younghvAuthor Commented:
DavisMcCarn -
The latest drivers for both monitors, the nVidia, and the motherboard are loaded (already mentioned).

The monitors are actually identified by name in Device Manager.

In the nVidia Control Panel, the ViewSonic is set for 1920x1080 (native).
Also (to re-state) when the ViewSonic is the only monitor connected, the POST -- through the Windows splash screen) displays fine, then the message "No Signal" is displayed.
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Davis McCarnOwnerCommented:
Did you try the Extend My Desktop process?
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younghvAuthor Commented:
DavisMcCarn - yes.
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Davis McCarnOwnerCommented:
So it works when you "extend your desktop"?
And, have you checked the vertical refresh rate?  The specs say 50-76hz.  If it is outside that range, the "no signal" message is from the Viewsonic and often means I can't deal with this.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
First, consider anything I'm repeating to be just a vote of confidence in someone else's prior assertion.  I trust younghv to only award me points if I contribute something no one else has said that leads to his solution.

In my experience, I seriously doubt this has anything to do with the motherboard.  I can't say I've setup MANY dual/multi monitor systems, though I'm working on one now and have a 3 monitor setup in my office.  I've never had an issue using both ports on one graphics card.  The only time the motherboard (BIOS) should come into play is if you are trying to use the onboard video with a graphics card video (enabling my triple monitor office setup required this using a Dell with onboard video and an nVidia graphics card).

I've found that DVI typically is considered the primary monitor by the video card's BIOS.

If I'm not misreading something, POST displays output on both monitors?

I would suggest starting from scratch, so-to-speak.  Uninstall your nVidia drivers.  Then reboot and re-install the latest drivers... and consider going back a version or two in drivers (sometimes the current ones are buggier than the older ones).

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younghvAuthor Commented:
@DavisMcCarn - no, the DVI cable does not work on either monitor - after the Windows 'Splash' screen. The refresh rate is set at 60.

@leew - thank you for checking in. Sorry for posting some confusing comments. That whole BIOS thing yesterday kind of blew my mind (what little is left of it).

The LG is connected to the primary port on the nVidia - with a a DVI --> VGA adapter and it works fine in Normal Mode.

The ViewSonic will not display in DVI mode under any combination of connections and when it is the sole monitor connected, it only displays during the POST. If I go into Safe Mode, it will display - but - the "Monitor" icon is missing when I go into "Device Manager".

The ViewSonic 'power button' does not change from amber at any time when it is connected (DVI) from the second nVidia port.

In a side comment, another Expert mentioned that I hook up the ViewSonic with a VGA cable - just to complete the initial dual-monitor/extended desktop configuration.

As I mentioned above, the whole dual monitor setup is not new to me, but I've never had even a single DVI monitor - much less dual.

I appreciate all of the comments/suggestions that have been made, but am concerned that I have managed to muck up my explanations so badly that it may be about time to 3-finger-salute this question and try again.

Before doing that, I am going to try the latest advice from "leew" and uninstall the nVidia drivers, then try again.

I will direct connect (not KVM) the ViewSonic to the primary port in the nVidia card and see what happens.

Thanks again to all who commented.
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willcompCommented:
Vic, has all this occurred with monitors connected via a KVM switch? First mention of a KVM that I've noticed.
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younghvAuthor Commented:
Dalton -
I might need to change my EE name to ImaMoron.

Yes - the LG is connected via KVM (the only VGA cable I had) and the ViewSonic is connected directly to the second port.

Even when I connect the ViewSonic directly into either port of the nVidia card (without the LG connected), there still is no display.
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willcompCommented:
What about the LG -- does it work correctly when connected via DVI as only monitor?
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younghvAuthor Commented:
Dalton - it is going to be a couple of hours before I can try that, but I will and then post back.
Thanks.

I still can't figure out the fail from POST to boot up, or why it works in Safe Mode, but not Normal.

Damn confusers!
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younghvAuthor Commented:
No joy with any configuration of either monitor in stand-alone mode.
I also tried with a Windows 7 (Ultimate) computer - just to see if this was an OS thing.

In my Google searches, I've been trying to figure out if that 'type' of cable I'm using means anything.

The ports on the nVidia and on my cables are shown in the attached images. Does it make any difference what 'type' of DVI cable I am using?
GeForce-9800-GT-bracket-med.png
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younghvAuthor Commented:
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khiggins1979Commented:
Good lord so many posts,
its obviously a driver issue. go to AMD.com and download their catalyst suite. use that to control your video display settings
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willcompCommented:
The video card has DVI-I ports (Analog + digital). Cable is a DVI-D (digital only) cable and so is the DVI port on Viewsonic monitor as shown on Newegg. You're limited to DVI-D cable due to monitor port.

I'm not sure what the heck is going on. We need the old geezer in Texas to get back.
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younghvAuthor Commented:
@khiggins1979 - should I do that before or after I "play with all the buttons" as you suggested in your last post?
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willcompCommented:
Do you have a different DVI cable?

I have an Acer P224w connected to a Radeon HD 3650 and a Radeon 9550 (about 5 years old) via a KVM with DVI ports. All connections are DVI-D cables. Also had monitor connected to on board video (GeForce 8100) and a GeForce 7300 PCIe card previously using DVI-D cable. Have had no problems with any of the configurations.
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willcompCommented:
Vic -- reckon ATI drivers would help on an nVidia card? ;-)
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Davis McCarnOwnerCommented:
Boy, don't you gotta love computers (mutter, mutter, mutter)
That cable is a single-link DVI-D cable and is probably the whole problem.  NVidia does not have their user's manuals available for download (which is nuts); but, the Gigabyte manual for the same board clearly says DVI-I or dual-link.
Since we know the analog works (the VGA adapter), I think your safest bet is to get a DVI-I cable $14.47 http://www.nextwarehouse.com/item/?159698_g10e  If you decide to look locally, you want to see 2 pins on each side of that flat blade at the end of the connector.
Here is an article on the various DVI pinouts: http://en.wikipedia.org/wiki/Digital_Visual_Interface
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willcompCommented:
Forgot to mention -- the 2 PCs connected with KVM switch are running XP Pro SP3 (Radeon 9550) and Win 7 Ultimate (Radeon HD3650)
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younghvAuthor Commented:
Dalton - I'm up at this site trying to edumacate myself on the pinouts for these things:
http://www.interfacebus.com/Design_Connector_Digital_Visual_Interface_DVI_Bus.html

Tomorrow I might go to the giant electronic store they have down in the flatlands and just buy one of each. I would think that the cable ViewSonic included in the box would be right - but who knows if the QC's the thing before packing it.

(The old guy hasn't posted since 10 April, so he might be on a boat to Tahiti.)

Maybe I'll try those Radeon 9550 drivers - since they work for you - *LOL*

@DavisMcCarn - for once I 'refreshed' the screen before posting and saw your suggestion.
Thank you for the details - I am going (not maybe) and getting the cables tomorrow.

Vic
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Davis McCarnOwnerCommented:
OOPS! I'm glad willcomp checked the Viewsonic.  Back in a minute but belay that DVI-I cable.
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younghvAuthor Commented:
"Belay that" - now you're talking language I can understand!
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willcompCommented:
You can check DVI port on Viewsonic and make sure it's DVI-D only. Picture of connections on Newegg clearly shows a DVI-D port.

From what I know, analog via DVI is no better than analog via VGA. You need the DVI digital to take full advantage of monitor capabilities.

And yes, one would certainly think Viewsonic sent the correct cable.

Incidentially, all my video cards (including on-board) have dual link DVI-I ports and so have all the others I've seen if memory is correct.
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Davis McCarnOwnerCommented:
OK. your LG is also DVI-D so the only way to get there from here is to use two VGA cables with adapters or a DVI-I to VGA cable: $5 http://www.amazon.com/KEYDEX-10FT-ANALOG-VIDEO-CABLE/dp/B003AUO5K8
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younghvAuthor Commented:
OK - to recap:
1. The nVidia Card has DVI-I Dual Link connectors.
2. The ViewSonic has a DVI-D receptacle
3. The LG has a DVI-D receptacle

I have tried using the DVI-D Single Link Male cable included with the ViewSonic - no joy on either monitor.

Am I stuck with only getting an analog connection?
I already have DVI/VGA adaptors if I'm going to be stuck with only that.

Hard to believe that a fairly high-end video card and a brand new (digital) monitor can't be connected - but it won't be the first time I bought something without doing my homework.

Thanks again for hanging in there on this one.
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Davis McCarnOwnerCommented:
Ah; but, guess what....... The plot thickens!
Cnet actually breaks up their card listings by the output type and that EVGA 9800 GT is listed on both DVI-I and DVI-D Dual Link (yeah!)
Then, it turns out that a Dual Link cable is needed for high resolutions because it uses two pins for each signal (reference worth reading http://www.datapro.net/techinfo/dvi_info.html )
So, both displays should work if you use a Dual Link cable and, after all this fuss, I'd like to know, huh?
$12.00 including shipping: http://www.newegg.com/Product/Product.aspx?Item=N82E16812189044&nm_mc=OTC-Froogle&cm_mmc=OTC-Froogle-_-Cables-_-Link+Depot+Corp.-_-12189044
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younghvAuthor Commented:
@DavisMcCarn -
I will commit to leaving the mountains tomorrow, going to the big city and buying 2 of those cables. It is an all day trip...but will be worth it to figure this thing out!

@everyone -
Y'all hang around and see how this works out.
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arnoldCommented:
younghv, I do not believe that the issue is with the cable nor with the graphics card.
You may have a bad DVI port on the monitor or an issue with a monitor.
Presumably you do not have another system or an alternate system where you can connect the viewsonic via the DVi to see if it works.
i.e. as you said when you boot the system with the ViewSonic as the only monitor connected via The DVI you get the boot/post message (640/480 or is it 800/600) as soon as the windows splash screen is supposed to come up which is is 1024/768 or the highest available resultion available.
Try the following:
While both monitors are plugged in including the viewsonic, set the resolution on the viewsonic while connected via DVi to 800x600 and see if it works.
or if you have access to another monitor that has a DVI port, connect that and see if it works.

Another thing to try is while viewsonic is the only monitor connected and after enough time has passed i.e. the system booted and loaded windows, remove the dvi cable from the current port on the graphics card and shift it to the other port to see whether it is the designated active port within windows.
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younghvAuthor Commented:
@DavisMcCarn - No joy with the new cables. Cost $65 + tax - but they will take them back. Actually met a pretty sharp youngster and the store and yakked about computer stuff in general.

Right now, I am running the extended desktop in VGA mode and have opened a ticket with EVGA - actually got my first response back in 45 minutes...but they just wanted a copy of my invoice.

The original video card was only about $130 - so I'm not inclined to spend much more time fooling around with this thing.  Might have to post a new question asking for recommendations on a replacement.

@arnold - I'm certainly no Expert on this hardware stuff, but I am fairly certain that we don't want to be 'hot-swapping' cables on a DVI card.

I did try your resolution suggestion, but no luck with that. So far, I have tried this card in three different computers (XP and Windows 7) and also tried three different DVI monitors on this card.

Unless someone can think of anything new, I'll just put this on hold until I hear back from EVGA (but not let it go 'abandoned').
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arnoldCommented:
Not sure you've mentioned that you've tried other working DVi monitors with this card.  In this case, it sounds as though the card might be bad i.e. having issues with the DVI side.

What do you use the system for? i.e. do you have graphics intensive application such that you need a high end card? Or is it enough for you to have a graphics card with Dual DVI ports with S-video or HDMI/display Port output?

If you have not checked whether newer drivers are available that potentially could fix this issue, http://www.evga.com/support/drivers/.

Not sure whether a possible issue deals with the SLI or it seems this card tends to run hot.  Just trying to get a picture of your system, what is the power supply rating? 500, 600, 700, 1000 Watt?
http://www.newegg.com/product/product.aspx?item=n82e16814130380

While sounds weird to ask, did you connect/plug-in the additional power to the card other than the power it would draw through the PCI-E slot??
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younghvAuthor Commented:
All -
The EVGA Help Desk diagnosed this as bad ports in the nVidia card and are sending me a replacement. The RMA has been approved.

Obviously, I have to "Accept as Solution" this comment so that future readers will know what the end result was - but - I will do the "Accept and Award Points" function and spread the points amongst the comments I think will help others.

If anyone has an objection to that, please post it now. I don't want to get in the middle of one of those "Objection" discussions.

Thanks.
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Davis McCarnOwnerCommented:
I'm Ok with whatever you decide; but, have to say that is one of the weirdest bad cards I heve encountered.  For it to work  in VGA mode then crap out at higher resolutions sounds more like a bug in the 9800 chip than a "bad port".
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younghvAuthor Commented:
@DavisMcCarn - I don't disagree with you. I was quite surprised that they did an RMA with only a couple of Help Desk posts from me.
Maybe it is a known issue - and they did have the caveat that the 'replacement' will be a card of 'similar or higher capability'.
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CallandorCommented:
I've had video cards that wouldn't work at higher resolutions, even though they should.  Standard procedure is to check the monitor with another working setup, try another cable, and then try a different video card.  It looks like you have arrived at the end of the trail.
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younghvAuthor Commented:
@Callandor -
Thank you for the post. Always good to see a comment from you.

If I do a new question asking for recommendations on a new video card, do you have anything specific you're using these days?
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CallandorCommented:
Depends on your budget and purpose - I just got an HD5770 to replace a faulty X1950.  Right now, the Radeons have the upper hand in terms of value and performance.
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younghvAuthor Commented:
@Callandor and All -

Here is the link to the actual question: http://www.experts-exchange.com/Q_26093058.html

I was not intending to ask one of those 'compound questions' in this string.
:))

Thanks,
Vic
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arnoldCommented:
That's a first time I've heard where one mode of a graphic card works while another does not.
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Davis McCarnOwnerCommented:
NVidia had a production line that was creating substandard head bonding between the silicon and its carrier.  The defects affected mostly laptops with NVidia chipsets; but, the 9600 and 9800 GPU's also were affected.  One of the symptoms of the failure is a blank screen.
The defect was corrected in 2008 and any newer chips will not have the problem.
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